Structural building joist



Aug. 20, 1929.

R. V. YEAGER STRUCTURAL BUILDING JOIST Filed Nov. 22, 1927 flle/73071 W @Mq/ZW Aizzmys,

Patented Aug. 20, 19,29.

UNITED STATES ROY V. YEAGER, OF DES MOINES, IOWA.

STRUCTURAL BUILDING JOIST.

Application led November 22, 1927. Serial No, 234,980.

My invention relates to that class of structural building joist in which there is employed a top or compression chord, a bottom or tension chord, with braces connecting the chords with each other and with bearings at th'e ends of the joists above the neutral axis of the joists.

The object of my invention is to provide a joist of this character with means whereio by sheets of building material, such for instance as plaster board, may be supported on the sides of the joists to form a bottom member of a mould int-o which a plastic concrete floor may be laid, which wholly surrounds, and forms a bond with, the top chord of the joist, to thereby cause the concrete floor to carry a considerable portion of the compression strains applied to the top chord, and to prevent the collapse of the joist by lateral movement of the top chord, due to compression strains. Y

More specifically it is my object to provide an improved sealing and supporting bracket device firmly secured to the joist for the double purpose of forming a rigid and strong support for the plaster board sheets, and at the same time to seal the spaces between the edges of the plaster board sheets and around the braces of the joist, so that plastic concrete material may be poured upon the top of the building sheets and the sealing and supporting brackets, and so that the brackets and building sheets co-operate in forming substantially liquid tight mould bottom for the concrete floor.

My invention consists in the construction, arrangement and combination of the various parts of the device,whereby the objects contemplated are attained, as hereinafter moi'e fully set forth, ointed out in my claims, and illustrated in the accompanying drawings, in which:

Figure 1 shows a vertical, transverse, sectional view through the central portion of a joist embodying my invention, with a concrete floor in position thereon.

Figure 2 shows a detail perspective view illustrating a portion of the sealing and floor sheet supporting bracket; and

Figure 8 shows a side elevation of a portion of a joist embodying my invention, with the sealing and supporting bracket applied thereto, and a concrete floor supported above the bracket and surrounding the top chord of the joist.

Referring to the accompanying drawings,

I have used the reference numeral 10 to indicate the top chord of the joist and 11 the bottom chord. .The braces between the top and bottom chords are indicated by the numeral 12. The end portions ofthe bottom chord are inclined upwardly and unite with lthe top chord and form bearings for the Applied to the sides of the joist is a sealing and building slab supporting bracket, preferably made of two parts of sheet metal, each part comprising a top member 14 arranged substantially horizontally and curved downwardly and then inwardly at 15. At the point where this bracket would engage the braces, the top member 14 is cut away and bent upwardly as shown at 16 in Figure 2, thus permitting the two adjacent edges of the bracket to engage each other, as shown in Figure 2, and to form openings through the bracket through which these joist braces may extend. I preferably permanently connect the bracket device to the joist by spot welding.

Mounted upon the outer edges of the bracket are building slabs 17, which may be of the usual plaster board construction, and they orm a mould bottom for the concrete floor 18.

In practical use the bracket is permanently applied to the joist, and the joist set in position in the ordinary manner. Then the building slabs 17 are laid in position with their edges resting upon the brackets and spaced apart from each other. When the concrete floor structure is poured, then the concrete mixture will pass in and around the portions of the braces 12 that are above the bracket, but this mixture will not flow downwardly through the spaces between the braces 12, because the upper portion of the bracket is shaped to form a sealing member to prevent the concrete from flowing through.

lVith my improved structure, the oists can be quickly set into position for forming a Hoor, and then the building slabs maybe placed in position with their edges resting upon the brackets, then the concrete floor may be poured, and when the concrete has set and hardened, it is so thoroughly united to, and bonded'with, the upper chord of the joist, and the upper ends of the braces, so that lateral movements of the upper chord, due to compression strains, is wholly prevented by the concrete floor, and hence with my improved joists the top chord may be made of relatively less cross sectional area thanthe bottom chord, and the completed structure presents an ornamental appearance as viewed from below. The brackets perform the additional function of uniting the brace members and preventing their dis tortion under strains.

I claim asmy invention:

l. A structural ioor joist, comprising` a top or compression chord, a bottom or tension chord, braces uniting the top and bottom chords, the bottom chord being of less cross sec-tional areathan the top chord, said chords being formed at their ends with bearings,

and a sealing and supporting bracket ixed to the brace members of the joist, and having its top surface substantially in line with the bearing members and extended between the brace members and shaped to receive and support Hoor supporting slabs, and to form a substantially concrete-tight surface between the edges of the floor supporting slabs, to thereby form a mould bottom for plastic concrete in the space between the outer edges of the bracket and between the brace members of the structural joist. Y

2. A structural floor joist comprising a top or compressiontchord, a bottom or tension chord, and brace members connecting them. said chords being formed at their ends with bearings, and a sealing and supporting bracket fixed to the joist and extended between the brace members and outwardly on Y both sides of the brace members, and being ROY V. YEAGER. 

